PHP Coinbase API를 사용해서 비트코인(BTC) 전송

<?php
$api_key = 'YOUR_API_KEY';
$api_secret = 'YOUR_API_SECRET';

$coinbase_url = 'https://api.coinbase.com/v2/accounts/YOUR_ACCOUNT_ID/transactions';

$data = array(
    'type' => 'send',
    'to' => 'RECIPIENT_ADDRESS',
    'amount' => '0.1', // 보낼 비트코인의 양
    'currency' => 'BTC'
);

$data_string = json_encode($data);

$ch = curl_init($coinbase_url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'CB-ACCESS-KEY: ' . $api_key,
    'CB-ACCESS-SIGN: ' . hash_hmac('sha256', $coinbase_url . $data_string, $api_secret),
    'CB-ACCESS-TIMESTAMP: ' . time(),
    'CB-VERSION: 2018-05-15'
));

$result = curl_exec($ch);
curl_close($ch);

$response = json_decode($result, true);

if ($response['data']['status'] == 'completed') {
    echo '비트코인 전송이 완료되었습니다.';
} else {
    echo '비트코인 전송이 실패하였습니다.';
}
?>